TABLE II.

Pitch ranking and electrode discrimination thresholds (α), and ECAP separation indices (Σ) for each subject. Pitch ranking and electrode discrimination α values approaching 0 indicate better performance. Psychophysical thresholds designated as “>1.0” indicate the subject could not rank or discriminate the adjacent physical electrodes. These values were excluded from the means and standard errors (SE). NR = no ECAP response.

	Pitch ranking (α)			Electrode discrimination (α)			ECAP separation index (Σ)
Subject	Basal	Middle	Apical	Basal	Middle	Apical	Basal	Middle	Apical
C8	0.31	0.59	0.31	0.49	0.69	0.72	1.61	2.40	1.53
C13	>1.0	0.32	0.62	>1.0	0.40	0.80	4.09	2.24	0.93
C17	0.96	0.93	0.97	0.98	>1.0	0.97	1.64	2.29	4.81
C22	0.59	0.80	0.88	0.86	0.85	0.85	2.73	1.95	2.18
C24	0.90	0.80	0.94	0.96	0.49	>1.0	3.87	3.52	4.57
C25	>1.0	0.71	0.43	>1.0	0.89	>1.0	1.10	2.37	1.04
C26	0.17	0.09	0.12	0.45	0.74	0.45	3.97	2.00	0.89
C29	0.34	0.09	0.27	0.74	0.76	0.85	1.83	1.95	1.69
C35	0.97	0.86	0.96	0.96	0.97	0.97	1.46	2.45	0.76
C39	0.25	0.19	0.17	0.34	0.49	0.56	2.24	1.72	0.88
C40	0.25	0.55	0.57	0.44	0.54	0.58	NR	2.74	1.33
MEAN	0.53	0.54	0.57	0.69	0.68	0.75	2.45	2.33	1.87
SE	0.11	0.10	0.10	0.09	0.06	0.06	0.38	0.19	0.49